Item::get_categories(): SimplePie\Category[]|null

396    public function get_categories()397    {398        $categories = [];399 400        $type = 'category';401        foreach ((array) $this->get_item_tags(\SimplePie\SimplePie::NAMESPACE_ATOM_10, $type) as $category) {402            $term = null;403            $scheme = null;404            $label = null;405            if (isset($category['attribs']['']['term'])) {406                $term = $this->sanitize($category['attribs']['']['term'], \SimplePie\SimplePie::CONSTRUCT_TEXT);407            }408            if (isset($category['attribs']['']['scheme'])) {409                $scheme = $this->sanitize($category['attribs']['']['scheme'], \SimplePie\SimplePie::CONSTRUCT_TEXT);410            }411            if (isset($category['attribs']['']['label'])) {412                $label = $this->sanitize($category['attribs']['']['label'], \SimplePie\SimplePie::CONSTRUCT_TEXT);413            }414            $categories[] = $this->registry->create(Category::class, [$term, $scheme, $label, $type]);415        }416        foreach ((array) $this->get_item_tags(\SimplePie\SimplePie::NAMESPACE_RSS_20, $type) as $category) {417            // This is really the label, but keep this as the term also for BC.418            // Label will also work on retrieving because that falls back to term.419            $term = $this->sanitize($category['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT);420            if (isset($category['attribs']['']['domain'])) {421                $scheme = $this->sanitize($category['attribs']['']['domain'], \SimplePie\SimplePie::CONSTRUCT_TEXT);422            } else {423                $scheme = null;424            }425            $categories[] = $this->registry->create(Category::class, [$term, $scheme, null, $type]);426        }427 428        $type = 'subject';429        foreach ((array) $this->get_item_tags(\SimplePie\SimplePie::NAMESPACE_DC_11, $type) as $category) {430            $categories[] = $this->registry->create(Category::class, [$this->sanitize($category['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT), null, null, $type]);431        }432        foreach ((array) $this->get_item_tags(\SimplePie\SimplePie::NAMESPACE_DC_10, $type) as $category) {433            $categories[] = $this->registry->create(Category::class, [$this->sanitize($category['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT), null, null, $type]);434        }435 436        if (!empty($categories)) {437            return array_unique($categories);438        }439 440        return null;441    }